Doi radiation detector

Abstract

In a DOI radiation detector, scintillation crystals are arranged in three dimensions on a light receiving surface of a light receiving element, and a response of a crystal having detected a radiation ray can be identified on the light receiving surface. Thereby, a position at which the radiation ray is detected is determined in three dimensions. In this DOI radiation detector, regular triangular prism scintillation crystals are used, and response positions of the respective crystals are shifted for each set. This allows crystal identification without loss even with a structure such as a three-layer or six-layer structure hard to achieve by a quadrangular prism scintillation crystal.

Description

TECHNICAL FIELD[0001]The present invention relates to a DOI radiation detector, and more specifically, relates to a DOI radiation detector which can realize crystal identification without loss even with a structure such as a three-layer or six-layer structure that is hard to achieve by a quadrangular prism scintillator crystal, and which is preferably used for positron imaging devices, positron emission tomography (PET) devices and the like in the fields of nuclear medicine imaging and radiation measurement.BACKGROUND ART[0002]A generally employed radiation detector is made by optical coupling between a scintillation crystal and a light receiving element. Meanwhile, in order to provide higher spatial resolution in positron imaging devices or PET devices, a DOI (depth of interaction) radiation detector (hereinafter also called DOI detector simply) capable of detecting a position of entry in a depth direction into a detecting element has been developed. More specifically, a crystal bl...

AI Technical Summary

Benefits of technology

[0032]The present invention has been made to solve the foregoing problems of the conventional techniques. A problem to be solved is to realize crystal identification without loss even with a structure such as a three-layer or six-layer structure hard to achieve by a quadrangular prism scintillation crystal.

[0037]The present invention allows crystal identification without loss even with a structure such as a three-layer or six-layer structure hard to achieve by a quadrangular prism scintillation crystal. The present invention also enhances position resolution in radiation detection using a scintillation crystal. The detector structure is simple and easy to fabricate, and withstands mass production that is an absolute necessity for nuclear medicine devices.

Problems solved by technology

A problem to be solved is to realize crystal identification without loss even with a structure such as a three-layer or six-layer structure hard to achieve by a quadrangular prism scintillation crystal.

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